M5Stack AtomS3R (C126) – ESP32-S3 with 0.85" colour display

The AtomS3R is the big brother of the AtomS3 Lite: same format, but with a 0.85" colour display, 8 MB PSRAM and a six-axis motion sensor.

The display makes a real difference in practice. You see straight away whether the device got an IP address, what the sensor is reading and whether Wi-Fi dropped, without opening Home Assistant.

It is also the controller M5Stack itself uses in its official guide for building a presence sensor with the TMOS PIR unit and Home Assistant.

Works with

• ESPHome
• Home Assistant
• Arduino IDE, PlatformIO, UIFlow

You also need

A USB-C data cable. For the presence-sensor project: a TMOS PIR unit (U185) and a Grove cable.

Specifications

• Processor: ESP32-S3R8, 240 MHz
• Memory: 512 KB SRAM, 8 MB PSRAM, 8 MB flash
• Display: 0.85", 128 × 128 px
• Sensor: BMI270 + BMM150 (6-axis IMU + magnetometer)
• Connectors: USB-C, Grove
• Size: 24 × 24 × 15 mm

Documentation and certification

• Product documentation (M5Stack)
• Home Assistant guide from M5Stack
• Manufacturer certifications (CE/RED/RoHS)

Manufacturer: M5Stack Technology Co., Ltd, Block A10, Expo Bay South Coast, Fuhai Street, Bao'an District, Shenzhen, China, [email protected]. EU representative: Success Courier SL, Calle Rio Tormes 1, Planta 1, Derecha, Oficina 3, 28947 Fuenlabrada, Madrid, Spain, [email protected].

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